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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
-18.41%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$34.1B
AUM Growth
+$2.94B
Cap. Flow
-$379M
Cap. Flow %
-1.11%
Top 10 Hldgs %
42.6%
Holding
8,576
New
1,199
Increased
2,701
Reduced
2,877
Closed
1,573

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$58.5M
2
GOOG icon
Alphabet (Google) Class C
GOOG
+$56.5M
3
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$44.1M
4
AAPL icon
Apple
AAPL
+$20.3M
5
XOP icon
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
+$12.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$109M
2
META icon
Meta Platforms (Facebook)
META
+$62.3M
3
QQQ icon
Invesco QQQ Trust
QQQ
+$36.2M
4
GS icon
Goldman Sachs
GS
+$27.1M
5
BA icon
Boeing
BA
+$24.7M

Sector Composition

Rank Sector Weight
1 Communication Services 0.49%
2 Consumer Discretionary 0.48%
3 Technology 0.4%
4 Financials 0.25%
5 Industrials 0.22%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
GERN icon
7276
Geron
GERN
$911M
– –
-32,409
Closed -$49.2K
GFF icon
7277
Griffon
GFF
$4.16B
– –
-4,527
Closed -$57.5K
GFI icon
7278
PUT
Gold Fields
GFI
$29.2B
– –
-21
Closed -$5K
GIC icon
7279
CALL
Global Industrial
GIC
$1.34B
– –
-3
Closed -$9K
GIGM icon
7280
GigaMedia
GIGM
$15.3M
– –
-173
Closed -$484
GLOB icon
7281
PUT
Globant
GLOB
$1.35B
– –
-5
Closed -$29K
GLP icon
7282
CALL
Global Partners
GLP
$1.64B
– –
-6
Closed -$10K
GLP icon
7283
Global Partners
GLP
$1.64B
– –
-1,785
Closed -$31.9K
GLPI icon
7284
Gaming and Leisure Properties
GLPI
$12.8B
– –
-3,396
Closed -$115K
GLRE icon
7285
Greenlight Captial
GLRE
$563M
– –
-3,677
Closed -$40.1K
GLW icon
7286
Corning
GLW
$126B
– –
-26,814
Closed -$856K
GME icon
7287
GameStop
GME
$9.5B
– –
-143,140
Closed -$501K
XRN
7288
Chiron Real Estate Inc
XRN
$544M
– –
-12
Closed -$551
GMS
7289
CALL
DELISTED
GMS Inc
GMS
– –
-2
Closed -$4K
GMS
7290
PUT
DELISTED
GMS Inc
GMS
– –
-1
Closed -$2K
GNL icon
7291
CALL
Global Net Lease
GNL
$1.87B
– –
-36
Closed -$75K
GNRC icon
7292
Generac Holdings
GNRC
$11.9B
– –
-955
Closed -$51.2K
GNSS icon
7293
Genasys
GNSS
$75.6M
$0 ﹤0.01%
200
-400
-67% -$1.1K
B
7294
Barrick Mining
B
$62.2B
– –
-22,286
Closed -$288K
GOOD
7295
Gladstone Commercial Corp
GOOD
$627M
– –
-51
Closed -$956
GOOS
7296
Canada Goose Holdings
GOOS
$868M
– –
-5,225
Closed -$291K
GPMT
7297
PUT
Granite Point Mortgage Trust
GPMT
$63.7M
– –
-2
Closed -$3K
GPRE icon
7298
Green Plains
GPRE
$1.19B
– –
-8,219
Closed -$135K
GPRK icon
7299
GeoPark
GPRK
$649M
– –
-4,767
Closed -$76.3K
GS icon
7300
Goldman Sachs
GS
$313B
– –
-134,493
Closed -$27.1M
290 291
292
293 294

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Simplex Trading's Q4 2018 Portfolio in Review

As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.

By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.

  • Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
  • Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
  • Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
  • Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
  • Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
  • Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.

Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.